is there a limit to number of photos that can be used for a memory movie

Thanks for your reply! I think I have found the answer. I create an album of photos for each of our trips. We just traveled to Spain and Portugal. My album that I created had over 500 photos, but there was no memory video created. In looking at my other albums, I noticed that the ones with less than 500 photos had a memory video, whereas those with more than 500 photos didn’t. I deleted photos in this album to less than 500 and a memory video was created. So 500 is the limit for a memory video.